[R] 2d plot with modification of plotting symbol to indicate third dimension.

Bert Gunter gunter.berton at gene.com
Wed Jan 12 22:08:37 CET 2011

Google on "R Graph Gallery" to find examples with code.

You can also almost certainly  RSiteSearch() on appropriate keys to
find a pre-existing function (which someone may provideyou on the

-- Bert

On Wed, Jan 12, 2011 at 11:19 AM, John Sorkin
<jsorkin at grecc.umaryland.edu> wrote:
> I would like to plot 3-dimensional data on a two-dimensional scatter-plot.
> Is there a way I can automatically modify the plot symbol (e.g. changing size or color) to indicate the value of a third variable? E.g. How can I plot weight vs. age and indicate the value of muscle mass for each value weight-age pair by making the plot point proportional to the subject's muscle mass?
> Thanks,
> John
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
> Confidentiality Statement:
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> and provide commented, minimal, self-contained, reproducible code.

Bert Gunter
Genentech Nonclinical Biostatistics

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